Extension piano-stool.



PATENTED JAN. 24-, 1905-.

' W. T. BROWN.

EXTENSION PIANO STOOL.

APPLIOATIONTILED JULY 18, 1904.

2 SEEBTB-SHIJET 1.

It INVENTOR: IBrowm,

'PATENTED JAN. 24, 1905. W. TJBROWN. EXTENSION PIANO STOOL.

APPLICATION FILED JULY 18, 1904.

2 SHEETS-SHEET z.

- UNITED STATES Patented January 24, 1905.

PATENT, OFFICE.

EXTENSION PIANO-STOOL.

SPECIFICATION forming part of Letters Patent No."780,859, dated January24, 1905,

Application filed July 18,1904. Serial No. 217,053-

To a, whom, it may concern.-

Be it known that I, WILLIAM THoMAs BROWN, a citizen of the UnitedStates, residing at J acksonville, in the county of Morgan and State ofIllinois, have invented new and useful Improvements in ExtensionPiano-Stools, of which the following is a specification.

My invention relates to improvements in what may be termed piano benchesor stools, especially for use as in playing duets, it of course beingequally applicable for use in connection also with organs, &c. It hasfor its object, among other things, to provide for simplicity andcompactness, to enable the assembling or putting together of the partswith facility and accuracy; to dispense with the use of tongued andgrooved slides and guides, consequently their necessary friction andtendency to render the operation unsatisfactory from swelling andshrinkage, and to secure readiness or promptness of action of the partsas the same is actuated.

Said invention consists of certain structural features, substantially ashereinafter more fully disclosed, and particularly pointed out by theclaims.

In the accompanying drawings, illustrating the preferred embodiment ofmy invention, Figure 1 is a perspective view thereof. Fig. 2 is a brokenvertical longitudinal section of the same with the parts collapsed orthe seat in its lowest position. Fig. 3 is a like view thereof with theparts extended or the seat at its maximum elevation. Figs. 4: andv 5'are detached views of a pair of the bail-like levers employed inconnection. with the adjustment or movement of the seat, respectively.Fig. 6 is a front view and a sectional View 'of one of the end slidesconnected up with a pair of vated position, and within said outer frameis arranged an inner frame 3,"having secured thereto the seat-board 4,adapted, as presently disclosed, to have vertical movement.

A shaft 5, having near its ends opposite or right-hand and left-handscrew-threads 5, is suitably journaled in the ends of the outer frame 1,the inner frame 3 being adapted to permit its unobstructed passage. Eachend of said shaft is provided beyond the ends of said outer frame with asuitable knob 5 for its convenient actuation, as in effecting theadjustment of the seat-board, while upon said shaft are slipped orinserted washers 5, interposed between shoulder-terminals of thescrew-threads of said shaft and the inner surfaces of the inner frame. 4

A pair of levers 66 is arranged within the bench or stool at each endthereof, each lever being, preferably, of bail shape and having lateralterminals or pivots 6 6"", respectively, said levers being arranged onewithin and crossing the other. The lever or bail 6 has itsarm-connecting or cross bar bearing within keepers 6", secured upon theinner surface of the base portion or bar 1 of the outer frame 1, whileits lateral end portions or pivots 6 are pivotally arranged Withintheupper corner of the recess 7 of a slide 7 disposed transversely within,but independently movable of the inner frame 3. The lever or bail- 6 hasits cross or arm-connecting bar pivot- .ally arranged at the uppercorner edge formed between the inner surface of the forward cross-pieceof the frame 3 andthe lower surface of the seat-board 4, keepers 8,suitably secured in position, being provided for forming a bearing forsaid arm-connecting bar. The lower end terminals or pivots 6 of thelever or bail 6 are pivotally arranged or bear in the lower corner edgeof the recess 7 a of the slide 7 Common means. in the form of ance ofthe movement of said slide, as in aiding to effect the adjustment of theseat-board as the screw-shaft 5 is actuated and presently more fullydisclosed. Said followers are provided upon opposed surfaces withprojections or studs 12, while the screw-shaft 5 has projectingtherefrom at right angles to the plane of said studs projections orstuds 13, designed to effect engagement with the-first-noted studs whenthe follower has been moved to the position indicated by Fig. 2 to limitthe movement of the latter as the seat-board is lowered to its initialposition.

It will be noted that, assuming the seatboard is in the position lastindicated, by suitably actuating the screw-shaft 5 the followers 10 willbe caused to move in reverse directions and toward the ends of the benchor stool, being initially distant from said ends. The right-linedmovement thus imparted to said followers will of course act upon theslides 7 and the latter in turn exert endwise movement upon the bails orlevers 6 6. Instantly withthe application of such movement to saidlevers the slides 7 will move upward accordingly, moving said levers orbails correspondingly, carrying with them the seat-board, whichactuation of said parts may be continued according to the requiredaltitude it may be desired to impart to said seat-board, the latterbeing automatically sustained after such operation of parts, as it isapparent the relation of the follower with said screw-shaft is such asto effect an interlocking action therebetween when outof operation,resulting in locking the other parts as against movement.

Latitude is allowed as to details herein, as they may be changed ascircumstances suggest without departing from the spirit of my invention.

I claim 1. Abench, or stool of the character described, employing pairsof levers pivoted to the seat-board and to the seat-frame, respectively, slides having pivotal connection with said levers, and screwactuated followers adapted to operate said slides.

2. A bench or stool of the character described, employing pairs oflevers of bail shape pivoted to the seat-board and to the seatframe,respectively, slides having pivotal connection with said levers, andscrew-actuated followers adapted to operate said slide.

3. A bench. or stool of the character described, employing pairs oflevers or bails pivoted to the seat-board and to the seat-frame,respectively, slides having pivotal connection with said levers,followers each having a sliding connection with said slides, and acommon screw-shaft adapted to actuate said followers.

i. A bench or stool of the character described, employing pairs oflovers or bails pivoted to the seat-board and to the seat-frame,respectively, slides having pivotal connection with said levers,followers having lateral cleats or extensions received within guidesupon said slides, and a common screw-shaft adapted to reversely actuatesaid followers.

5. A bench or stool of the character described, employing pairs oflevers or bails pivoted to the seat-board and to the seat-frame,respectively, slides each having a recess and a clamp,with steppedlongitudinal edges adapted to cooperate with the corresponding edges ofsaid recess to receive and form bearings for the arm-connecting bar ofone lever and the end terminals of the other lever of each pair,respectively, followers having sliding connection with said slides and ascrew-shaft adapted to reversely actuate said followers.

6. A bench or stool of the character described, employing pairs oflovers or bails, a movable seat-board, slides and followers, each ofsaid followers having a sliding connection with each of said slides, thecross-bars of a pair of levers being pivotally connected to a slide andto the seat-board, respectively, the end terminals of the levers beingpivoted upon the outer frame of the bench or steel and upon said slide,respectively, and means for reversely actuating said followers.

7. A bench or stool of the character described, employing pairs oflevers or bails, a movable seat-board, slides and followers, each ofsaid followers having a sliding connection with each of said slides, thecross-bars of a pair of levers being pivotally connected to a slide andto the seat-board, respectively, the end terminals of the lovers beingpivoted upon the outer frame of the bench or stool and upon said slide,respectively, and a common screwshaft having right-hand and left-handscrewthreads engaging said followers, respectively.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

lVM. Tll OS. BRO W N.

Vit'nesses:

Geo. E. BAX'rnn, (J. B. Sawrnn.

